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Alternative name: Great Northern Diver; Great Northern Loon
 Adult breeding
 Adult non-breeding
Some show whitish bills but culmen is always dark.
 Similar Species
Best distinguished from smaller species by heavy build and bill and from the Yellow-billed Diver (G. adamsii) by straighter, usually darker bill, held horizontally.
Common and widespread across North America breeding from Alaska south to northern Washington and east to the Great Lakes and New England. Absent from north-central Arctic Canada and south-central Canada. Also breeds in Greenland and Iceland. Possibly breeds regularly on Bear Island and has bred in Scotland.
Winters in North America from the Aleutians south to northern Mexico in the west and from Newfoundland to the Gulf Coast in the east. European birds winter from Iceland and northern Norway south to northwest France with vagrants recorded on the Azores, on the Mediterranean coast of North Africa and in Ukraine.
Breeds on medium-large, deep lakes in tundra and forest areas.
Winters at sea in bays and estuaries, sometimes large inland waters.
Breeds late-May or early June to September. Nests beside water often on an island or spit, a shallow scrape or more rarely a substantial mound of vegetation built in shallow water in reedbeds. Eggs: 2 (1 in replacement clutch), olive-brown, sometimes more greenish with sparse black blotches (90 x 57mm). Incubated by both sexes for 29-30 days. Young tended by both sexes, feed themselves at 40 days and fly at about 72 days
Fish, also molluscs and crustaceans caught during 60-120 second dives.
Familiar loud wailing and yodelling calls during the breeding season.
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